“If it acts like a duck (all the time), it’s a duck.  Doesn’t matter if the duck thinks it’s a dog; it’s still a duck as far as the rest of us are concerned.  Authenticity, for me, is doing what you promise, not ‘being who you are.’  That’s because ‘being’ is too amorphous and we are notoriously bad at judging that.  Internal vision is always blurry.  Doing, on the other hand, is an act that can be seen by all.”

Seth Godin, Whatcha Gonna Do With That Duck?